lost. advice needed!

My friend and I are TTC (me actively and my friend in a more relaxed sense), I've got a 5 year old already but it would be her first.
I found out after 6 weeks she rang me to tell me her test came back positive at 2 weeks, we were all so excited and couldn't believe it..
Literally within a week I find out she's lost the baby and won't talk to anyone and can't cope, I'm worried about her because I know how happy she was just the other day!
As a friend I don't know what to do, I don't know why the pregnancy didn't/couldn't progress, and knowing that I'm TTC I'm unsure what will happen if I become pregnant now, do I keep it to myself? Tell her? 
Too many questions and sadness going through my brain for her 😩 any advice? 

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